CKD progress stage 3 to 4
Chronic kidney disease (CKD) Stage 4 is on the path to kidney failure, but there is little information on the risks associated with progression to Stage 4Â per se. The objective of this study is to determine how progression from Stage 3 to Stage 4 CKD alters morbidity and mortality in a referred cohort of patients.
We conducted a retrospective cohort study consisting of 1607 patients with estimated glomerular filtration rate (eGFR) of 30â59 mL/min/1.73 m2Â referred to a nephrologist at a tertiary care center in Ontario, Canada, between January 2001 and December 2008. Interim progression from Stage 3 to Stage 4 chronic kidney disease was defined by two independent outpatient eGFR values <30 mL/min/1.73 m2. Death, acute kidney injury (AKI) and all-cause hospitalizations subsequent to Stage 4 progression, but prior to the development of end-stage renal disease (ESRD), ascertained from administrative databases.
The mean (standard deviation) baseline eGFR was 43 (8) mL/min/1.73 m2. Over 2.66 years (interquartile range: 1.42â4.45), 344 (21%) patients progressed to Stage 4, 47 (3%) developed ESRD, 188 (12%) patients died, 143 (9%) were hospitalized with AKI and 688 (43%) were hospitalized for any reason. Compared with patients who did not progress to Stage 4, those who did progress had significantly higher adjusted risks of death [hazard ratio (HR) = 2.56, 95% confidence interval (95% CI): 1.75â3.75], AKI (HR = 2.32, 95% CI: 1.44â3.74) and all-cause hospitalization (HR = 1.87, 95% CI: 1.45â2.42).
Progression from Stage 3 to Stage 4 CKD is associated with increased risks of death, AKI and hospitalization prior to ESRD.